Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
thien van » thi van
van sach » ban sach, van hach, ngan sach
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cuu tre » cua tre, cau tren, cau treo
truc va » thuc va, thuc vat, trung va
co sach » bo sach, cuon sach, hoc sach
ho nang » thi nang, kha nang, cao nang
lo nang » ly nang, loai nang, cao nang
ca tren » cau tren, cu tren, la tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((lo nang) OR (ho nang)) xa hoi. thien van sach truc va thanh vi ((cuu tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((lo nang) OR (ho nang)) xa hoi. thien van sach truc va thanh vi ((cuu tre) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((lo nang) OR (ho nang)) xa hoi. thien van sach truc va thanh vi ((cuu tre) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: co sach ((lo nang) OR (ho nang)) xa hoi. thien van sach truc va thanh vi ((cuu tre) or (ca tren))*.